20111111021212 has 24 divisors (see below), whose sum is σ = 35314591440240. Its totient is φ = 10021286087040.

The previous prime is 20111111021167. The next prime is 20111111021233. The reversal of 20111111021212 is 21212011111102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5912089 + ... + 8670352.

It is an arithmetic number, because the mean of its divisors is an integer number (1471441310010).

Almost surely, 2^{20111111021212} is an apocalyptic number.

It is an amenable number.

20111111021212 is a deficient number, since it is larger than the sum of its proper divisors (15203480419028).

20111111021212 is a wasteful number, since it uses less digits than its factorization.

20111111021212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14583621 (or 14583619 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 16.

Adding to 20111111021212 its reverse (21212011111102), we get a palindrome (41323122132314).

The spelling of 20111111021212 in words is "twenty trillion, one hundred eleven billion, one hundred eleven million, twenty-one thousand, two hundred twelve".